Decorative plaque



FIG. 1 is a front elevation, showing my new design with the environmental structure associated therewith shown in broken lines;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevation view; and,

FIG. 6 is a front view of my design, without the environmental structure being shown in broken lines. 

The ornamental design for a decorative plaque, as shown and described. 